X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=configure.ac;h=c7899e461ae3f20028697cbc0ae57abec07e1c11;hb=7dd06a04f1135e6b463c7a8596b0c055fbf1aaaf;hp=878e1ced57a47496addc1235f335a1cf92f3b990;hpb=b7fa35fce415b33207a9eba111069ed31ef122a0;p=babeltrace.git

diff --git a/configure.ac b/configure.ac
index 878e1ced..c7899e46 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,7 +29,7 @@ AC_PREREQ([2.50])
 m4_define([bt_version_major], [2])
 m4_define([bt_version_minor], [0])
 m4_define([bt_version_patch], [0])
-m4_define([bt_version_extra], [-pre5])
+m4_define([bt_version_extra], [-rc4])
 m4_define([bt_version], bt_version_major[.]bt_version_minor[.]bt_version_patch[]bt_version_extra)
 
 AC_INIT([babeltrace], bt_version, [jeremie dot galarneau at efficios dot com], [], [https://efficios.com/babeltrace/])
@@ -248,9 +248,9 @@ AM_CONDITIONAL([HAVE_FLEX], [test "x$have_flex" = "xyes"])
 # Check what libraries are required on this platform to link sockets programs.
 AX_LIB_SOCKET_NSL
 
-# Check for glib >= 2.22 with gmodule support
-AM_PATH_GLIB_2_0([2.22.0], [],
-  AC_MSG_ERROR([glib >= 2.22 is required - download it from ftp://ftp.gtk.org/pub/gtk]),
+# Check for glib >= 2.28 with gmodule support
+AM_PATH_GLIB_2_0([2.28.0], [],
+  AC_MSG_ERROR([glib >= 2.28 is required - download it from ftp://ftp.gtk.org/pub/gtk]),
   [gmodule-no-export]
 )
 
@@ -616,17 +616,9 @@ AS_IF([test "x$exec_prefix" = xNONE], [
 
 AC_SUBST(LIBDIR)
 
-
-# Set global CFLAGS in AM_CFLAGS
-AM_CFLAGS="-Wall -Wformat -Werror=implicit-function-declaration $PTHREAD_CFLAGS $GLIB_CFLAGS"
-AC_SUBST(AM_CFLAGS)
-
-# Set global CPPFLAGS in AM_CPPFLAGS
-AM_CPPFLAGS="-I\$(top_srcdir)/include -I\$(top_builddir)/src -I\$(top_srcdir)/src -include common/config.h"
-AC_SUBST(AM_CPPFLAGS)
-
-# Add glib to global link libs
-LIBS="$LIBS $GLIB_LIBS"
+# CFLAGS from libraries (the glib ones are needed for the following sizeof
+# test).
+AM_CFLAGS="${PTHREAD_CFLAGS} ${GLIB_CFLAGS}"
 
 # Check that the current size_t matches the size that glib thinks it should
 # be. This catches problems on multi-arch where people try to do a 32-bit
@@ -634,6 +626,10 @@ LIBS="$LIBS $GLIB_LIBS"
 # glib.h is not platform specific but it includes glibconfig.h which is and
 # is usually installed in a non-standard path.
 
+# Do this before enabling all the warning flags, as the
+# AC_LANG_PROGRAM-generated program may generate some warning, which makes this
+# test fail unnecessarily.
+
 # Older versions of the pkg-config macros disallows PKG_* in the autoconf
 # output. Specifically allow pkg_config_libdir to be able to print the
 # error message.
@@ -657,6 +653,68 @@ target.
 ])
 CFLAGS=${save_CFLAGS}
 
+# Detect C and LD warning flags supported by the compiler.
+AX_COMPILER_FLAGS(
+	[WARN_CFLAGS], dnl CFLAGS variable name
+	[WARN_LDFLAGS], dnl LDFLAGS variable name (unused for now)
+	[], dnl is-release
+	[], dnl Extra base CFLAGS
+	[ dnl Extra "yes" CFLAGS
+		dnl Disable these flags, either because we don't want them
+		dnl or because we want them but are not ready to enable them
+		dnl yet.
+		-Wno-sign-compare dnl
+		-Wno-inline dnl
+		-Wno-declaration-after-statement dnl
+		-Wno-switch-enum dnl
+		-Wno-switch-default dnl
+		-Wno-packed dnl
+		-Wno-pointer-arith dnl
+		-Wno-format-nonliteral dnl
+		-Wno-double-promotion dnl
+		-Wno-cast-align dnl
+		dnl
+		dnl Some versions of SWIG (like 3.0.12) generate code that produces
+		dnl -Wcast-function-type warnings.  This warning is present in gcc >= 8.  This
+		dnl combo happens on RHEL/Centos 8, for example.  Later versions of SWIG (like
+		dnl 4.0.1) have the correct function signatures to not produce this warning.
+		dnl It's simpler to just disable the warning globally.
+		dnl
+		dnl Note that the Debian/Ubuntu SWIG package 3.0.12-2 contains a local patch to
+		dnl fix this (python-fix-function-cast-warnings.patch), so you won't be able to
+		dnl reproduce the warning using that package.
+		dnl
+		dnl Ref: https://github.com/swig/swig/issues/1259
+		-Wno-cast-function-type dnl
+	])
+
+# CFLAGS from AX_COMPILER_FLAGS.
+AM_CFLAGS="${AM_CFLAGS} ${WARN_CFLAGS}"
+
+# The test used in AX_COMPILER_FLAGS, generated using AC_LANG_PROGRAM, is
+# written in such a way that it triggers a -Wold-style-definition warning.  So
+# if the user has -Werror in their CFLAGS, that warning flag will end up
+# disabled, because the test program will not build.
+#
+# Enable it here unconditionally.  It is supported by GCC >= 4.8 and by Clang
+# (it is accepted for compatibility although it has no effect), and there is
+# not reason to not want it.
+
+AM_CFLAGS="${AM_CFLAGS} -Wold-style-definition"
+
+# We want this one to always be an error.
+AM_CFLAGS="${AM_CFLAGS} -Werror=implicit-function-declaration"
+
+# Done for AM_CFLAGS.
+AC_SUBST(AM_CFLAGS)
+
+# Set global CPPFLAGS in AM_CPPFLAGS
+AM_CPPFLAGS="-I\$(top_srcdir)/include -I\$(top_builddir)/src -I\$(top_srcdir)/src -include common/config.h"
+AC_SUBST(AM_CPPFLAGS)
+
+# Add glib to global link libs
+LIBS="$LIBS $GLIB_LIBS"
+
 # Abuse autoconf's AC_ARG_PROGRAM output variable 'program_transform_name'
 # to rename babeltrace2.bin to babeltrace2 at install time.
 program_transform_name="s&babeltrace2\.bin&babeltrace2&;$program_transform_name"